User Manual
Contents
1. WTSSR M STACKABLE DATA MODULES All modules in this series incorporate two EIA TIA 232E serial ports which communicate at 9600 baud no parity 8 data bits and 1 stop bit DB9 connectors are jumpered to satisfy hardware handshaking port labeled HOST is configured as a DCE device and should be connected to a PC s serial port The port labeled SLAVE is a DTE device and can be left open or connected to another module s host port Up to 32 modules can be chained together in this fashion to form a network Either plugged together end to end or separated by a cable Because a module contains two individual bi directional ports which pass data through it also acts as a repeater extending the total allowable length of the RS 232 communications line A modem can serve as the host for remote operation but since a modem uses a DCE port a null modem adapter must be placed between the modem and the data module s host port A gender changer may also be required In addition any hardware software flow control must be disabled in the terminal program Each module in a network should be set to a different address using the on board 32 position DIP switch A module will only respond to data packets that begin with its own unique header character which is determined by this DIP switch setting See Table 1 Data packets transmitted by a module will also begin with this header character The host PC can u2. Trans Rec Indicator LED Flashes whenever there is communications between host PC and Data Module RS 232 RS 232 Slave Port Host Port Connects to Connects to the Host port the serial of another port of the Data Module host PC Q m g Relay Indicator LEDs Turns on when the relay is closed turns off when the relay is opened Power Source Jumper Power Supply Inputs Relay Outputs Draw power from external input Will accept any voltage Optically isolated solid terminals or from an upstream between 8 and 20 VDC state relays can switch Data Module via the host port up to 170 mA each 3 1 Copyright 2001 2010 by Weeder Technologies Page 7 Rev H WTSSR M Weeder Technologies DCE PORT DTE PORT 8 to 24 VDC SOLID STATE RELAY MODULE 1 WTSSR
3. eeder Technologies 90 A Beal Pkwy NW Fort Walton Beach FL 32548 WTSSR M www weedtech com Solid State Relay Module FEATURES 5 optically isolated solid state relays DIP switch addressable stack up to 32 modules on the same port for 160 relays Wire relays directly to existing switches to allow software control of their operation Control each relay individually or update all five relays as a group Read current on off state of relays from host On board relay closure indicator LEDs give visual confirmation of relay on off states Delay timer allows momentary relay closings and openings with a single command Built in sequencer for complex triggering Set default state of each relay which will be loaded upon power up Industry standard RS 232 interface Meets all EIA TIA 232E and V 28 specifications Wide power supply range 8 to 20 VDC Screw terminal connectors used on all inputs and outputs DESCRIPTION Connects to the RS 232 serial port of a PC laptop or other host Relay outputs can be wired directly in place of or in parallel with existing low current pushbuttons and toggle switches to enable software control of the switch operation Outputs can also be used to switch external solenoids actuators or high current relays A relay can be instructed to open or close and remain at that new state or switch back to the previous state after a user defined dela
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5. power supply source PAUSE Loads an internal timer which will signal the host when the time interval has expired Selectable range is from 1 to 65535 mS This function is useful when time derived operations or events must be executed without having to rely on timekeeping from the host Note the communications port will be disabled until this function has completed SEQUENCE Loads a string of WRITE and PAUSE statements which will begin executing sequentially The event will commence immediately following the reception of the carriage return which terminates the command packet The syntax for each WRITE and PAUSE statements should be the same as if using these commands separately and should be placed end to end with no separators between them Listed below is a typical sequence command string that will perform the following SW10000P60000W01000P5000W00100 Close relay A pause for 60 seconds open relay A and close relay B pause for 5 seconds open relay B and close relay C Note if any syntax error exists within the sequence command string the error symbol will be transmitted to the host and the sequence will not execute DEFAULT Sets the default state open or closed of a specified relay channel which will then be loaded upon power up or brown out ECHO Turns on or off the confirmation echo which is used to verify reception of a command If reception confirmation is not needed turning ECHO off will increase the
6. repetitive rate at which the host can manipulate the relays ERROR Any data string sent from the host containing the correct header character but an invalid command or variable will be responded to with this error indicator RESET Upon power up or any other reset condition this indicator is transmitted to the host Note all user configuration data is stored in non volatile memory Therefore a reset or loss of power will not corrupt these settings OPERATION To hook the data module to a host PC use a standard RS 232 cable with male and female DB9 connectors on opposite ends This cable should be wired straight through pin to pin with no crossover of the data lines In other words not a null modem cable Connect a suitable DC power source to the and terminals of the data module It is highly recommended to use an ungrounded AC adapter such as that which is available from Weeder Technologies This will provide isolation and prevent ground loops which are commonly created if the power supply and computer are grounded at different points Copyright 2001 2010 by Weeder Technologies Rev H Weeder Technologies When the data module is first powered up the red LED will flash briefly This indicates that the on board microcontroller has booted successfully completed its internal diagnostic test and has transmitted the reset character to the host to signal that it is up and running The red LED will also flash a
7. screen Refer to the help files for more information RELAY CLOSURE INDICATORS Each of the five solid state relays has its own relay closure indicator LED which is located near the relay s screw terminal pairs This LED will light when the associated relay is closed and distinguish when it is opened This provides a visual indication of the current state of each relay channel and is especially useful during the setup and testing of complex sequence and timing events CONTROLLING A SWITCH The outputs of the WTSSR can be wired directly parallel with existing low current pushbutton toggle switch key pad contacts etc Polarity doesn t matter This enables a program running on a host PC to activate those switches as if they were being operated manually thus allowing control of virtually any piece of electronic equipment or device which uses Copyright 2001 2010 by Weeder Technologies Rev H Weeder Technologies switches or buttons for user input Furthermore the original switch can remain in the circuit without any ill effect allowing either manual or software control of those contacts The included time field in a CLOSE or OPEN command string is very useful when it comes to controlling external momentary pushbutton switches This feature allows the host to address that particular action with a single command instead of two separate commands with a delay in between Furthermore the time field for each relay
8. 600 baud it will take approximately 1 mS to transmit each character in a packet To calculate the amount of delay needed to cause the first sequence to wait and begin at the same time as the second simply add up the number of characters in the second sequence command string including the header character command title carriage return and space between packets Then use this value in the PAUSE statement at the beginning of the first sequence command string Note when addressing multiple data modules in a network there must be at least a 1 mS gap between data packets transmitted from the host See the application note AN200 at the back of this manual for more details on this subject When synchronizing three or more modules a similar approach is used However the offset delay for each sequence will be a unique value since it is relative to the position the command packet lies in reference to the last command packet being transmitted by the host To calculate the wait time for each sequence count the total number of characters and spacings that will follow the carriage return of that particular data packet and include that value its associated PAUSE statement at the start of the sequence Copyright 2001 2010 by Weeder Technologies Rev H Weeder Technologies Address Setting This DIP switch sets the address of the Data Module and determines the header character of its data packets WTSSR M
9. can be re loaded at any time before it expires allowing it to function as a form of Watchdog Timer If it is not re loaded at regular intervals the relay will change states SWITCHING HIGH CURRENTS Each channel of the Solid State Relay Module can switch currents up to 170 mA If larger currents need to be switched an external relay can be used as long as the current needed to saturate the coil of the relay is within the range of the WTSSR To control the external relay simply connect an output pair of the WTSSR in series with the voltage source which supplies current to the coil of the relay CONSTRUCTING SEQUENCES A sequence is very useful when there is a need for precise timing related executions of multiple relay closures and openings Especially when the timing requirements are too complex for a typical PC or other host to handle in real time The SEQUENCE command function allows a user to build a series of events and time delays which will execute independent of the host The structural composition of sequence consists of two basic commands WRITE and PAUSE which can be placed in any order and any frequency as long as the total string of commands does not exceed 110 characters A WRITE command updates the state of all relays at the exact same time a PAUSE command defines the amount of delay before moving on to the next WRITE command All timing is kept with an autonomous clock which is unaffected by the individual event
10. cation WTSSR mod which be found in the ModCom subfolder called Samples After this file is opened it will appear as shown in Figure 1 To start the main run loop click on the green toolbar button at the top of the screen At this point you will see the relay default settings load into the windows at the bottom right section of the screen To control relays A B and C click on the buttons in the Manual Operation section of the screen In the Self Timed Operation section a Push Button activates the Button Array below it which transmits a CLOSE command to the WTSSR using a different time setting depending WTSSR M cate Run Loop Place Object Security 583 Solid State Relay Module Press a button to toggle state _Open Open Open Hold down a button to activate Unlocked int 2 Lox on which button in the array is active In the Run Sequence section each Push Button executes a sequence which is identical in overall operation however one is loaded into the WTSSR using its SEQUENCE command the other is written into and run from ModCom s own Sequence section To get a better understanding of how this application works first halt the run loop by clicking on the red toolbar button at the top of the screen then right click on any screen object to view its properties Sequences Conditionals can be accessed by going to the lt Run Loop gt menu item at the top of the
11. er a user defined time out period in the range of 1 to 65535 mS Note the timer will operate in the background allowing the other relays to be manipulated during this period The timer can also be re loaded before it times out TABLE 2 COMMAND SET WTSSR M OPEN Opens the specified solid state relay The relay can be instructed to remain open until a further command or close back up after a user defined time out period in the range of 1 to 65535 mS Note the timer will operate in the background allowing the other relays to be manipulated during this period The timer can also be re loaded before it times out READ Reads the current state open or closed of a specified relay channel or reads the current state of all relay channels simultaneously as a 5 bit port in binary notation If used as the latter a five character ASCII string will be returned whose digits represent the open close state of each relay channel WRITE Writes data to all relay channels simultaneously as a 5 bit port in binary notation Data consists of a five character ASCII string whose digits represent the open close state of each relay channel TITLE COMMAND DESCRIPTION Close relay for period equal to time relay time 1 to 65535 listed in milliseconds If time omitted relay remains closed Note 3 Open relay for a period equal to time relay A E time 1 to 65535 Suey
12. nytime the module receives or transmits any data packet thus making it a valuable diagnostic tool when troubleshooting communications problems An easy to use Windows software package called ModCom is available and can be downloaded from Weeder Technologies web site This program will allow the user to quickly set up custom buttons which transmit commands custom windows that poll for data and a variety of other screen objects such as slider controls event counters timers bar graph level indicators button selection arrays and more In addition conditional statements can be set up to take action when specific events or conditions are met sequences can be written and then called by other screen objects during run time and data can be logged to a file automatically at user defined intervals Once ModCom is installed and running go to the lt Communicate gt menu item at the top of the screen and click on lt Send Receive gt A dialog box will pop up which you can use to type in the commands from Table 2 transmit them directly to the data module and see the response coming back Use this dialog box to familiarize yourself with the command set to experiment with the various features supported by the module The experience gained here is significant since these are the same command strings you will use when setting up the other objects in ModCom To control the Solid State Relay Module start with the sample appli
13. racter see Table 1 and terminated with a carriage return All responses from the data module will also appear in this format Note 2 Any spaces shown above in the listing of the command strings are for clarity only They should not be included in the actual transmission from the host nor expected in a response from the data module Note 3 If ECHO is on after successful execution this command will be echoed back to the host in the same format as received Copyright 2001 2010 by Weeder Technologies Page 3 Rev H Weeder Technologies WTSSR M TABLE 3 TERMINAL CONNECTOR DESCRIPTION NAME TYPE ELECTRICAL SPECS COMMENTS RS 232 serial port configured as DCE HOST DB9 EIA TIA 232E Standard Connects to host PC Hardware handshake female jumpered DB RS 232 serial port configured as DTE Can SLAVE ae EIA TIA 232E Standard be connected to another data module s HOST port for networking Power Power source selection jumper Selects Source SIS ne either external or port powered Note 1 Screw Term 8 to 20 VDC External unregulated power supply input Screw Term GND External power supply ground V max 250V DC or AC peak ae A E Screw Term max 170 mA AC or DC Solid state relay contact pairs Note 1 Selecting port powered will draw from the power supply source of an upstream data module Caution the COM port of a PC or laptop does not supply enough current to serve as the
14. s that make up a sequence In other words there is no accumulative timing error as the sequence progresses from event to event regardless of the number of events in the sequence This is even true if multiple PAUSE commands are placed consecutively in the sequence to allow for longer delay periods WTSSR M MULTI BOARD SYNCHRONIZING When using more then one Solid State Relay Modules in a network it may sometimes be desirable to synchronize the events between them so that the relay actions of one module will line up with that of another The SEQUENCE function is ideal for this task because the user can pad the start of each event with a delay period which will compensate for the lead lag times inherent with communicating with multiple devices over a shared data line In order to run a sequence on two different modules concurrently the host PC must address each module with a separate data packet one right after the other This introduces a timing offset between the exact moment that each of the two sequences begins its execution A sequence launches immediately following the reception of the carriage return at the end of the associated data packet therefore the offset is equal to and can be measured from the carriage return of the first transmitted packet to the carriage return of the second packet To align the two sequences the first sequence must start with a PAUSE statement loaded with a time value equal to this offset At 9
15. se the header character to address each individual module in a network and to identify a module which is talking COLLISION CONTENTION The utilization of the communications line can be thought of more as a single bi directional data bus operated in a multi drop mode rather then a standard RS 232 data link A transmission from a data module travels in both directions upstream to the host and downstream to signal other modules that it has seized the line Before transmitting module will listen to the communications line and wait for quiescence After a silent period equal to the length of one byte the waiting module will send its data packet using a Carrier Sense Multiple Access with Collision Detection communications protocol See the application note AN100 at the back of this manual for more details EE Copyright 2001 2010 by Weeder Technologies Rev H Weeder Technologies COMMAND SET The host PC communicates with the Solid State Relay Module using a command set comprised of standard ASCII character strings as depicted in Table 2 Some commands evoke immediate action on one or more relay channels of the data module while other commands initiate timing related events or sequences which will then execute independent of the host A detailed description of each command follows CLOSE Closes the specified solid state relay The relay can be instructed to remain closed until a further command or open back up aft
16. u listed in milliseconds If time omitted relay remains open Note 3 Read current state of relay Returns relay C or relay O relay A E READ R relay C closed O open If relay omitted read relays A E as a 5 bit port in binary notation 1 closed 0 open Relay A MSB Write datato relays A E as a 5 bit port in binary notation MATE data 00000 to 11111 1 closed 0 open Relay A MSB Note 3 Loads an internal timer which will signal the host when expired PAUSE P time time 1 to 65535 and is listed in milliseconds When this function is complete the P character will be returned to the host Loads a string of WRITE and PAUSE statements which will begin SEQUENCE S string executing sequentially string may contain up to 110 characters When this function is complete the S character will be returned to the host Sets the default state of a specific relay which will be loaded upon DEFAULT D relay state power up or brown out relay A E state or O closed O open If state omitted reads the current setting Note 3 ECHO X vale Turns on or off the reception confirmation echo Value 0 or 1 0 off 1 on default 1 If value omitted reads the current setting ERROR This character will be returned after invalid command variable RESET This character will be returned after a power on reset or brownout Note 1 All command strings sent to the data module should be preceded with the header cha
17. y period Built in event sequencer allows user to load a series of relay on off patterns and time delays which will execute sequentially Voice Fax 850 863 5723 SPECIFICATIONS Relay Type Voltage Range Maximum Current Relay Isolation On State Resistance Off State Leakage Relay Turn On Time Relay Turn Off Time Output Capacitance Processor Clock Communications Power Requirements Current Draw Operating Temperature Board Dimensions Weight 5 SPST normally open 0 to 250V DC or AC peak 170 mA AC or DC 4 000 VRMS 15 maximum 1 0 pA maximum 3 0 mS maximum 0 5 mS maximum 50 pF maximum PIC16F628 4 MHz 9600 Baud N 8 1 8 to 20 VDC 11 to 40 mA 20 to 706 3 1 x 2 0 x 0 7 1 8 2 Copyright 2001 2010 by Weeder Technologies Rev H Weeder Technologies TABLE 1 ADDRESS SETTING HEADER DIP SWITCH CHARACTER SETTING ASCII HEX 1 O off Bs A 41 00000 B 42 00001 43 00010 D 44 00011 E 45 00100 F 46 00101 G 47 00110 H 48 00111 49 01000 J 4A 01001 K 4B 01010 L 4C 01011 M 4D 01100 N 4E 01101 O 4F 01110 P 50 01111 a 61 10000 b 62 10001 63 10010 d 64 10011 65 10100 f 66 10101 g 67 10110 h 68 10111 i 69 11000 j 6A 11001 k 6B 11010 6C 11011 m 6D 11100 n 6E 11101 6F 11110 p 70 11111
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